RUN: %cpp_compiler %S/SimpleTest.cpp -o %t-MutationStatsTest
RUN: not %run %t-MutationStatsTest -print_mutation_stats=1 2>&1 | FileCheck %s

# Ensures there are some non-zero values in the usefulness percentages printed.
CHECK: stat::mutation_usefulness:   {{[0-9]+\.[0-9]+}}